Antihistamines block radiation-induced increased intestinal blood flow in canines

Journal Article · Sat Jun 01 00:00:00 EDT 1985 · Fundam. Appl. Toxicol.; (United States)

DOI:https://doi.org/10.1016/0272-0590(85)90107-1· OSTI ID:5217485

Cockerham, L G; Doyle, T F; Donlon, M A; Gossett-Hagerman, C J

Radiation-induced systemic hypotension is accompanied by increased intestinal blood flow (IBF) and an increased hematocrit (HCT) in dogs. Histamine infusion leads to increased IBF and intestinal edema with consequent secretion of fluid into the intestinal lumen. This study was performed to determine whether these effects could be diminished by prior administration of H1 and H2 histamine blockers. Dogs were given an iv infusion of mepyramine (0.5 mg/min) and cimetidine (0.25 mg/min) for 1 hr before and for 1 hr after radiation (H1 and H2 blockers, respectively). Mean systemic arterial blood pressure (MBP), IBF, and HCT were monitored for 2 hr. Systemic plasma histamine levels were determined simultaneously. Data obtained indicated that the H1 and H2 blockers, given simultaneously, were successful in blocking the increased IBF and the increased HCT seen after 100 Gy, whole-body, gamma radiation. However, the postradiation hypotension was only somewhat affected, with the MBP falling to a level 28% below the preradiation level. Plasma histamine levels reached a sharp peak, as much as 20% above baseline, at 4 min postradiation. These findings implicate histamine in the radiation-induced increase in IBF and HCT but not for the gradual decrease in postradiation blood pressure.

• Research Organization: Armed Forces Radiobiology Research Institute, Bethesda, MD
• OSTI ID: 5217485
• Journal Information: Fundam. Appl. Toxicol.; (United States), Vol. 3
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANTIHISTAMINICS
RADIOSENSITIVITY EFFECTS
HYPOTENSION
RADIOINDUCTION
INTESTINES
BLOOD FLOW
BLOOD
BLOOD PRESSURE
DOGS
GAMMA RADIATION
HISTAMINE
VOLUME
WHOLE-BODY IRRADIATION
AMINES
ANIMALS
AZOLES
BIOLOGICAL MATERIALS
BODY
BODY FLUIDS
DIGESTIVE SYSTEM
DRUGS
ELECTROMAGNETIC RADIATION
EXTERNAL IRRADIATION
GASTROINTESTINAL TRACT
HETEROCYCLIC COMPOUNDS
IMIDAZOLES
IONIZING RADIATIONS
IRRADIATION
MAMMALS
MATERIALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANS
RADIATIONS
VERTEBRATES
560152* - Radiation Effects on Animals- Animals